alignment(reply): aligning the Reply logic with the Rust api.

[DariusIMP]

Replacing the reply logic from:

for (reply in channelReceiver) {
    when (reply) {
        is Reply.Success -> println("Received ('${reply.sample.keyExpr}': '${reply.sample.payload}')")
        is Reply.Error -> println("Received (ERROR: '${reply.error}')")
        is Reply.Delete -> println("Received (DELETE '${reply.keyExpr}')")
    }
}

to

 for (reply in channelReceiver) {
    reply.result.onSuccess { sample ->
        when (sample.kind) {
            SampleKind.PUT -> println("Received ('${sample.keyExpr}': '${sample.payload}')")
            SampleKind.DELETE -> println("Received (DELETE '${sample.keyExpr}')")
        }
    }.onFailure { error ->
        println("Received (ERROR: '${error.message}')")
    }
}

On Kotlin, the type of the error param from onFailure is always Throwable. With the changes introduced here, It can be downcasted into a ReplyError which allow accessing the payload as a ZBytes and the encoding.

For instance:

 for (reply in channelReceiver) {
    reply.result.onSuccess { sample ->
        when (sample.kind) {
            SampleKind.PUT -> println("Received ('${sample.keyExpr}': '${sample.payload}')")
            SampleKind.DELETE -> println("Received (DELETE '${sample.keyExpr}')")
        }
    }.onFailure { error ->
         error as ReplyError       
         println("Received (ERROR: '${error.payload}' with encoding '${error.encoding}')")
    }
}

[github-actions]

PR missing one of the required labels: breaking-change bug dependencies documentation enhancement new feature internal

[github-actions]

PR missing one of the required labels: breaking-change bug dependencies documentation enhancement new feature internal

[sashacmc]

LGTM!